Aug
10.
An Upper Level High Pressure Ridge (“Arch “Shape) cranks up the heat big time. The graphics for days 1-3 show no frontal systems moving through the Pacific Northwest. The graphics for days 3-7 Wednesday through Sunday show no frontal systems on the way to Oregon until a cold front moves through on Thursday and then another cold front pushes through next Sunday.
ADVISORIES:
- AN EXTREME HEAT WARNING IS IN EFFECT UNTIL 10 PM TUESDAY FOR TUALATIN VALLEY, PORTLAND WEST HILLS AND CHEHALEM MOUNTAIN, INNER PORTLAND METRO, EAST PORTLAND METRO, OUTER SOUTHEAST PORTLAND METRO, WEST CENTRAL WILLAMETTE VALLEY, EAST CENTRAL WILLAMETTE VALLEY, BENTON COUNTY LOWLANDS, LINN COUNTY LOWLANDS, LANE COUNTY LOWLANDS, WEST COLUMBIA RIVER GORGE I-84 CORRIDOR, UPPER HOOD RIVER VALLEY, AND CENTRAL COLUMBIA RIVER GORGE I-84 CORRIDOR.
- A HEAT ADVISORY IS IN EFFECT UNTIL 2 AM WEDNESDAY FOR CENTRAL DOUGLAS COUNTY.*AN EXTREME HEAT WARNING IS IN EFFECT UNTIL 2 AM WEDNESDAY FOR EASTERN CURRY COUNTY AND JOSEPHINE COUNTY, AND JACKSON COUNTY.
- *AN EXTREME HEAT WARNING IS IN EFFECT UNTIL 10 PM TUESDAY NIGHT FOR THE EASTERN COLUMBIA RIVER GORGE OF OREGON, THE LOWER COLUMBIA BASIN OF OREGON, AND THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS OF OREGON.
- AN EXTREME HEAT WARNING IS IN EFFECT UNTIL 10 PM TUESDAY FOR THE JOHN DAY BASIN, THE FOOTHILLS OF THE SOUTHERN BLUE MOUNTAINS OF OREGON, NORTH CENTRAL OREGON, AND CENTRAL OREGON.
- A HEAT ADVISORY IS IN EFFECT UNTIL 11 PM MONDAY FOR THE NORTH OREGON COAST RANGE LOWLANDS, THE CENTRAL OREGON COAST RANGE HIGHLANDS, AND THE LOWER COLUMBIA RIVER.HEALTH ADVISORIES:
- A PERMANENT HEALTH ADVISORY REMAINS IN EFFECT FOR THE SOUTH UMPQUA RIVER BAR. POOLS IN THE BEDROCK ALONG THE RIVERS EDGE ARE KNOWN TO DEVELOP BLUE-GREEN ALGAE (CYANOBACTERIAL) BLOOMS THAT CAN BE HARMFUL TO PETS AND PEOPLE IF ACCIDENTAL INGESTION OCCURS. SIGNS HAVE BEEN POSTED ALONG SEVERAL ACCESS AREAS ALONG THE RIVER.
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Air Quality Index:
Eugene/Springfield: The Air Quality Index is 53 in the Moderate category measuring Particulate Matter.
Oakridge: The Air Quality Index is 29 in the Good category measuring Particulate Matter.
Cottage Grove: The Air Quality Index is 54 in the Moderate category measuring Particulate Matter.
Data courtesy of Lane Regional Air Protection Agency (LRAPA.org)
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Eugene-Springfield Area Pollen count:
GRASS: 3 LOW
TREES: 0 ABSENT
WEEDS: 0 ABSENT
Measured 8.7.25
Data courtesy of Oregon Allergy Associates.
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Forecast for the Southern and lower Mid Willamette Valley including Eugene-Springfield and Albany-Corvallis:
- Clear tonight,
- Sunny and a bit warmer (Hot ) Monday, clear Monday night,
- Sunny and a bit cooler (still very warm) Tuesday, clear tonight,
- Sunny and a bit cooler Wednesday, then mostly clear Wednesday night.
- lows 63-54 highs 101-88.
- Mostly sunny and a bit cooler Thursday, mostly clear in the evening, partly cloudy late Thursday night,
- Mostly sunny and a bit cooler Friday, partly cloudy in the evening, mostly cloudy with a slight (20%) chance of showers at night,
- A mix of clouds and sun Saturday, partly cloudy in the evening, mostly cloudy late Saturday night,
- Then a mix of clouds and sun Sunday.
- highs 83-82 lows 54-58 cooling to 56 Saturday night. (seasonal averages high 85 low 52).
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Forecast for the Umpqua Valley including Roseburg:
- Mostly clear tonight,
- Sunny and a bit warmer (Hot) Monday, clear Monday night,
- Sunny and a bit cooler (still Hot)|Tuesday, clear at night,
- Mostly sunny and cooler Wednesday, then mostly clear Wednesday night.
- lows 69-62 highs 103-104 cooling to 100 Tuesday.
- Mostly sunny Thursday, mostly clear Thursday night,
- Partly cloudy Friday, partly cloudy with a slight (20%) of showers at night,
- Then partly cloudy with a slight (20%) chance of showers Saturday, partly cloudy Saturday night,
- Then partly cloudy Sunday.
- highs near 85 lows 58-56 warming back to 58 Saturday (seasonal averages high 87 low 58).
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Forecast for The South Oregon Coast Including Coos Bay and North Bend:
- Mostly clear tonight,
- Sunny and a bit cooler Monday, mostly clear in the evening, partly cloudy late Monday night,
- Some AM clouds, sunny and slightly cooler Tuesday afternoon,mostly clear in the evening, mostly cloudy late Tuesday night,
- Partly cloudy and a bit cooler Wednesday, then partly cloudy Wednesday night.
- lows 60-58 highs 82-76.
- Partly cloudy and a bit cooler Thursday and Thursday night,
- Mostly cloudy with a slight (20%) chance of AM showers, partly cloudy Friday afternoon with a slight (20%) chance of showers, mostly cloudy with a slight (20%) chance of showers at night,
- Mostly cloudy with a slight (20%) chance of AM showers, just partly cloudy and a bit warmer Saturday afternoon, mostly cloudy Saturday night,
- Then mostly cloudy Sunday.
- highs 74-72 warming back to 74 Saturday lows 57-55.
- (seasonal averages high 67 low 54). _______________
Forecast for the Northern Oregon Cascades including the Cascades in Lane County:
- Clear tonight,
- Sunny and a bit warmer Monday, clear Monday night,
- Sunny and a bit cooler Tuesday, clear at night,
- Sunny and a bit cooler Wednesday, then mostly clear Wednesday night.
- free air freezing level above 16,000 ft. tonight and Monday, above 16,000 ft. falling to 16,000 ft. Monday night, 16,000 ft. Tuesday and Tuesday night, then 15,000 ft. Wednesday and Wednesday night.
- lows 54-58 cooling to 56 highs 87-89 cooling to 84 Tuesday.
- Sunny and a bit cooler Thursday, mostly clear Thursday night,
- Mostly sunny and slightly cooler Friday, partly cloudy with a slight (20%) of evening rain, mostly cloudy with a slight (20%) chance of rain late at night,
- Then sunny and a bit warmer with a slight (20%) chance of rain Saturday, partly cloudy in the evening, mostly cloudy late Saturday,
- Then mostly sunny Sunday.
- free air freezing level 14,000 ft. Thursday through Friday, snow level above 8,000 ft, Friday night and Saturday, free air freezing level 14,000 ft. Saturday night, then 13000 ft. Sunday.
- highs 77-70 warming to 72 Saturday lows 47-45.
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